rfc48: refine Roles section

Problem: maintainers are mentioned outside the Roles section,
and administrators are not defined.

Since we are distinguishing between individual project Maintainers
and the framework Administrators, be explicit about that in the
Roles section.

Author: garlick

spec_48.rst

@@ -45,15 +45,28 @@ GitHub projects hosted within it.
 
 The development and community management of the project will follow the governance rules described in this document.
 
-Project Maintainers
-===================
-
-Project maintainers have admin access to the GitHub repository. Maintainers vary by GitHub project, and are viewable in the ``CODEOWNERS`` file provided in each respective project.
-
 Roles
 =====
 
-This project includes the roles of **Maintainer** and **Contributor,** each of which is defined under `RFC 1 <https://flux-framework.readthedocs.io/projects/flux-rfc/en/latest/spec_1.html#preliminaries>`_. 
+:doc:`spec_1` defines the following roles for each GitHub project within
+the flux-framework organization:
+
+Contributor
+  A person who wishes to provide a patch.  This person may be added to the
+  GitHub project without commit access, or they may be "free range"
+  contributors without special access.
+
+Maintainer
+  A person with commit access.  The file ``MAINTAINERS.md`` within each
+  project defines the GitHub identities of the project Maintainers.
+
+In addition, we define the following role for the overall project, e.g.
+the flux-framework organization:
+
+Administrator
+  A person with the GitHub administrator access to the organization and all its
+  projects.  The organization `README.md <https://github.com/flux-framework/.github/blob/main/profile/README.md>`_
+  defines the GitHub identities of the organization administrators.
 
 Development Workflow
 ====================